Kernrechtsfrage
When does the 20-day appeal period begin for a zoning plan adopted by the city parliament and subject to optional referendum?
Extrahierter Entscheid
The appeal period started with the city parliament's decision of 20 March 1997, not with a later referendum-related date or notification date.
Extrahierte Begründung
Section 63(3) PBG does not expressly regulate this special case, but interpretation in context, legislative materials, and legal certainty show that the decisive triggering event is the parliamentary approval itself.